i'm down - It's like saying, 'I'm with you, and I'm not even trying.'

It's like saying, 'I'm with you, and I'm not even trying.'

'I'm down with that idea? I'm down with that idea. Why not?'

'I'm down with that plan? I'm down with that plan. I'm not even thinking about it.'

'I'm down with that life? I'm down with that life. I'm not even pretending I'm not.'